Furnace grate



Apr. 24,` 1923.

G. c. EHRBAR 1FURNACE GHATE f2 Sheets-Sheet l Filed June 29. 1921 G. C. EHRBR plj. 2 4, 1923.

FURNAGE 'GRATE Y Filed June 29,1921 2 4Smets-sheet 2 Patented 24, i923.

NT lFiE.

FUEJNACE GRATE.

Application filed .Tune 29, 1921. Seria1-No. 481,290.

T 0 all whom it may concern.: Y

Be it linown that l, GEORGE C. linmean, a citizen of the United States, residing al Cleveland. in the county of Cuyahoga and State of Ohio, have invented certain' new and useful lmprovements in Furnace Grates, of which the following is a specification.

This invention relates to improvements in fire grates.

The object of this invention is to provide a'grate that will burn fuel with a maximum of efficiency.

More particularly the objects of the present invention are to provide means for burning fuel in such a manner that the gases generated will be consumed as they are released and the ash and cinder residue reduced to a minimum.

@ther objects will be apparent from the following description and claims when considered in connection with the accompanying` drawings.

. Referring to said drawings, Fig'. 1 is a plan view of an assembled grate.

n Fig. 2 is vertical longitudinal section on line 2--2, of Fig. 1.

Fig. 3 is an elevation of one of the grate bars.

Fig. l is a vertical cross section on line 1-#1, of Fig. 1.

Fig. 5 is a vertical cross section on line 5 5, of Fig. 1.

The fire grate indicated at 6 comprises interchangeable top bars 7, spaced apa-rt by bars S, which have deepy webs or walls 8a extending downwardly to engage the sides of interchangeable bars 9. The top surface of bars 9 lie in a plane substantially lower than the plane of the top of bars 7 and 8, forming a depression 10 as shown in the drawings. The bars 7 are composed of lon git-udinal tf-shaped ribs 7a re-enforced by middle cross webs 7b and terminating in end blocks 7c. 7c form spacing lugs and are adapted to butt, the spaces between ribs 7a forming` slots 7d. rlhe bars 9 are similar to bars 7, having V-shaped ribs 9, re-enforced by webs 9b and terminating` in end blocks 9c the sides of webs 9b and ends 9c being adapt-- ed to butt, forming slots 9d between the ribs 9a. A portion of the slots 9d may be iilled by webs 9e connecting the tops of ribs 9a, forming a closed bar for purposes hereinafter described. The bars 8 are composed of a Vmshaped rib 8a, similar to ribs The sides of webs 7b and ends 7a and 7b, connected by re-enforcing webs 8b and ends 8 to a vertical wall on deep rib 8e, the space between forming slots 8d. Lugs 8f on walls 8e are adapted to butt against the sides of ends 9c and webs 9b and 9e and spiace the ribs apart.

The ends 7C and 8C of bars 7 and 8 are supported by cross angle irons 11 and the bars 9 are supported by cross ,angle irons 12. The angle irons 11 and 12 are secured to the brick work of the furnace in any suitable manner.

To start the fire, coal is piled on the clean grate and lrindling or other suitable inflammable materials are placed on top and ignited. rlhe coal is ignited by theA burning kindling at the top and sides of the pile, combustion proceeding downwardly. The process of combustion is accelerated or retarded by the air draft which passes upwardly through slots 7, 8d and 9d in the grate, through the fuel pile, and escapes through the boiler flue. There the depth of the fuel pile is shallow, as along the edges, the resistance offered to the passage of the draft will be slight, thereby causing the coal to burn more freely than at the middle over depression 10, where the passage of the draft upwardly is obstructed more by the greater depth of coal, thereby reducing the draft and retarding combustion at the middle part of the grate.

With the fire burning downwardly'and toward the middle of the coal bed and the air draft passing upwardly, no gases will be generated other than those; at the point of combustion, said gases being consumed as they are generated and released, none escaping and wasting, thereby increasing the efficiency of the fire. Furthermore, the coal will be thoroughly burned, reducing the ashes `and clinkers to a minimum.

Portions of slots 9d in grate bars 9 in depression 10 may be closed by webs 9e to further obstruct combustion in said depression 10 at a point nea-rest to the flue, counteracting the pull of the draft which is strongest at that point, thereby distributingr the progress of combustion evenly as desired, The depth and width of depression 10 is varied to suit the furnace requirements.

The above described grates are simple in construction with parts removable and interchangeable at a small cost, and can be manufactured and sold at low price.

Other features of the invention will be apparent to those Who are skilled in the art to which it relates.

l claim:

A furnace grate comprising; side sections and an intermediate section therebetween, each side section consisting 0I" spaced bars provided with spacing lugs at the ends and the middle thereof, the intermediate see-tion being depressed thruout its entire length below the level of the side sections and coosistingof bars having depending cross Webs 9b et the middle thereof, that part of the bars in front of said Webs being,` spaced apart, and that part of the bars in the rear of said Webs having laterally extending' tops 9e meeting to form a closed rear part of said intermediate section.

1n testimon7 whereof, I do afHX my signature in presence of two Witnesses.

GEORGE C. EHRBAR. Vitnesses:

JOHN A. BoMMi-IARDT, Bessm F. POLLAK. 

